Whoops, John Mayer Accidentally Dissed Taylor Swift On Her Birthday

Yesterday was Taylor Swift's birthday, which means nearly every member of her celebrity squad, from Camila Cabello and Gigi Hadid to Todrick Hall, took to their social media accounts to wish her a happy 27th.

On Twitter, it was love all around. That is, until Tay's ex, John Mayer, jumped into the mix with a seemingly shady tweet calling December 13 the lamest day of the year.

Though John didn't mention Taylor by name, fans immediately assumed John was shading her. After all, the pair's brief 2010 relationship didn't exactly end on the best note, since both went on to write not-so-flattering songs about each other. Can you blame fans for jumping to conclusions? How can a day be conceptually lame ... unless it's the birthday of that ex who wrote that song about you? Please explain, John.

Of course, fans flooded his mentions, calling him out for the apparent diss.

John deleted the tweet, and fans came at him even harder for trying to bury his tracks. As it turns out, though, the insult may have been unintentional. John finally responded by explaining he never meant to insult anyone. At 39, he said, he's too old to be shading people on Twitter.

OK, considering it's been six years since Taylor and John dated, maybe he's not losing all that much sleep over their breakup anymore. Maybe it is just an innocent coincidence. Maybe Taylor's biggest day of the year just so happens to be John's lamest. Stranger things have happened, I guess.